oracle查询库中所有关联关系表

select u1.CONSTRAINT_NAME, u1.TABLE_NAME as table_, u2.TABLE_NAME as reference_
from user_constraints u1, user_constraints u2
where 
u1.constraint_type='R' and
u1.R_CONSTRAINT_NAME = u2.CONSTRAINT_NAME and
u2.table_name='target_table_name'